GB1577044A - Check valve assembly - Google Patents
Check valve assembly Download PDFInfo
- Publication number
- GB1577044A GB1577044A GB19481/78A GB1948178A GB1577044A GB 1577044 A GB1577044 A GB 1577044A GB 19481/78 A GB19481/78 A GB 19481/78A GB 1948178 A GB1948178 A GB 1948178A GB 1577044 A GB1577044 A GB 1577044A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- check valve
- assembly
- cover
- fluid flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
- E03C1/106—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using two or more check valves
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
- E03C1/108—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves having an aerating valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
- F16K1/2007—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member specially adapted operating means therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
- F16K1/2021—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member with a plurality of valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
- F16K15/033—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member spring-loaded
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
- F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K2200/00—Details of valves
- F16K2200/20—Common housing having a single inlet, a single outlet and multiple valve members
- F16K2200/204—Common housing having a single inlet, a single outlet and multiple valve members in series
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/3149—Back flow prevention by vacuum breaking [e.g., anti-siphon devices]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/3149—Back flow prevention by vacuum breaking [e.g., anti-siphon devices]
- Y10T137/3185—Air vent in liquid flow line
- Y10T137/3294—Valved
- Y10T137/3331—With co-acting valve in liquid flow path
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/7898—Pivoted valves
- Y10T137/7901—Valve head movably connected for accommodation to seat
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Check Valves (AREA)
- Pipeline Systems (AREA)
- Safety Valves (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
A backflow prevention assembly designed for connection between a main supply line and a service pipe in water supply service, comprising two check valves in series and a relief valve for draining the chamber between the two check valves under certain operating conditions.
Description
PATENT SPECIFICATION
( 11) 1 577 044 Application No 19481/78 Divided out of No 1577042 ( 22) Filed 11 Mar 1977 Convention Application No 668627 ( 32) Filed 19 Mar 1976 in ( 33) United States of America (US) ( 44) Complete Specification Published 15 Oct 1980 ( 51) INT CL 3 F 16 K 15/03 ( 52) Index at Acceptance F 2 V 10 M E 1 B J 3 ( 54) CHECK VALVE ASSEMBLY ( 71) We, ROCKWELL INTERNATIONAL CORPORATION, a corporation of the State of Delaware, United States of America, having a place of business at 600 Grant Street, Pittsburgh, Pennsylvania 15219, U S A, do hereby declare the invention for which we pray that a patent may be granted to us and the method by which it is to be performed to be particularly described in
and by the following statement:-
This invention relates to check valve assemblies.
One application of this type of assembly is in backflow prevention assemblies as used for preventing contamination of public water distribution systems by preventing backflow or back-siphonage into the system These assemblies are usually installed between the main supply line and a service line to a particular installation, such as a hotel, factory, institution, or the like.
One form of backflow prevention assembly is described and claimed in our copending patent application 10320/77 (Serial No 1577042) of even date herewith, and comprises a first check valve, a second check valve arranged in series with the first check valve and a pressure differential operated relief valve connected with a zone between the outlet of the first check valve and the inlet of the second check valve for draining that zone when a given pressure differential exists between the inlet pressure of the first check valve and the pressure in said zone.
In a "reduced pressure principle", backflow prevention assembly, the relief valve is designed so that it will open when the pressure in the zone approaches the pressure on the inlet side of said first check valve, as is well understood in the art Said relief valve may be constructed as described and claimed in our co-pending patent application No.
19480/78 (Serial No 1577043) of even date herewith.
According to the invention there is provided a check valve assembly including a housing, a valve seat in said housing defining part of a fluid flow passageway through the assembly, a valve cover mounted on said housing for pivotal movement about an axis normal to the direction of fluid flow along said passageway and adapted to cooperate with said valve seat to control fluid flow through said valve assembly, a track fixedly mounted at the rear of said valve cover extending in a direction normal to the pivot axis of said valve cover, a roller assembly mounted on said track for movement thereon, link means pivotally connected at one end with said valve cover and projecting rearwardly from said valve cover, the other end of said link means being pivotally mounted on said roller assembly, means biasing said roller assembly to a valve closed position, said link means making an acute angle with the direction of fluid flow when said valve cover is in the closed position whereby a large portion of the force tending to open said valve cover is exerted against said track.
A preferred embodiment of the invention is now more particularly described with reference to the accompanying drawings, wherein:
Figure 1 is a top view of a backflow prevention assembly; Figure 2 is a section along the line II-II of Figure 1, with a portion of a clapper control frame of one check valve of the assembly broken away to show a hinge construction; and Figure 3 is a force diagram of the force on a link member between a check valve and a spring-roller combination of the assembly, showing the resolution of this force into components and their place of application.
Referring to Figures 1 and 2, 10 is a backflow prevention assembly A main case, or body, 12 has covers 14 and 16 closing the access to check valve mechanisms 18 and 20, qc c ( 21) ( 62) ( 31) ( 19) 1,577,044 respectively These covers are held in leaktight relationship by bolts 22 These covers 14 and 16 are made separately for convenience they could be easily be one unit Fixed in the top of each, in fluid communication with the interior of the assembly, are test cocks 24, used for periodically testing the assembly Fixed on one side, in communication with the chamber between the two check valves, is relief valve 26.
This assembly is as described and claimed in our co-pending patent application No.
10320/77 (Serial No 1577042) and is mounted in a flow line, usually between a pair of gate valves (not shown), by bolts into the main housing (not shown) The normal direction of flow from the main supply line is as shown by the arrow in Figure 2.
The check valves 18 and 20 are identical in construction and operation, except for the sizes of the springs Accordingly, only the upstream check valve will be described in detail, and this will also apply to the downstream check valve The inlet 28 through the main case 12 is a uniform size and receives a valve seat 30 in its inner end The valve seat has a rib 32 around the outside that bears against a shoulder 34 of the inlet opening.
The seat 30 is retained in place by a snap ring 36 The clearance between inlet 28 and seat is sealed by an 0-ring 38 The inner end 40 of seat 30 is beveled to produce a smaller bearing surface for contact with a facing ring (not shown) seated in the face of clapper 42.
Clapper 42 is suspended from a shaft 44 by a clapper control frame 46 Shaft 44 is seated in the main case 12 behind projections 48 and is held there by covers 50 screwed on top of projections 48 by screws 52 The clapper control frame 46 is generally U-shaped with the open end up, and a cross-brace near the top for stiffness The legs are bent fowardly (as seen in Figure 2, this would be to the left) and are drilled to accept shaft 44, which has its axis in the plane of end 40 of seat 30.
Clapper 42 is fastened to clapper control frame 46 by a shaft 54, which also mounts links 56 There are 2 projections 58 on the back of clapper 42 The clapper and links are pivotable on shaft 54 This allows limited pivoting of clapper 42 to adjust to face 40 of valve seat 30.
There are 2 links 56 pivotally mounted on shaft 54 The other end of these links mounts a spring carrier 60 between them, and each link carries a roller 62 on a spindle 64 Seated on spring carrier 60 is a spring 66 The other end of the spring 66 is seated on a boss 68 case into each cover (in this case, cover 14).
biasing the spring carrier 60 the rollers 62 and links 56 downwardly As seen in Figure 2, links 56 are designed to be of a length that, when clapper 42 is firmly against end 40 of seat 30 the links form an angle of approximately 30 degrees with the horizontal The rollers 62 ride on vertical rails or guides 70.
These rails are fixed, one on each sidewall of the main case, on bottom bosses 72 cast on the inside wall of the main case The top of each rail is fixed by a cover plate (not shown) 70 screwed on the main case.
By the above construction, it can be seen that a spring having a loading approximately 1/2 of the total force necessary to keep the check valve closed is able to be used Refer 75 ring to Figure 3 we see the force diagram corresponding to this construction The desired force on the check valve face to open the check valve at the desired pressure drop is calculated, and this force is transmitted 80 through the link 56 which is represented in Figure 3 as the resultant Some of this force is resisted by the component labeled "Load Against Tracks", while the remainder is resisted by the spring force, labeled "Spring 85 Load" Thus, a smaller spring can be used in this installation Here is the only difference between check valve mechanism 18 and check valve mechanism 20 The upstream check valve is designed to open and close at a 90 higher differential than the downstream one, so a stronger, heavier spring is used in check valve 18 than in check valve 20 In one size flow line, the pressure differential across upstream clapper 42 requires 8 p s i to open 95 the check valve, while across the downstream check valve, only 2 p s i is needed to move the clapper This condition means that the upstream check valve is first to close.
As mentioned above, the only difference 10 ( between the check valve 18 and the check valve 20 is the size of the spring Accordingly, check valve assembly 20 will not be further described here.
In order to be certain that fluids from the 10 ' service line do not backflow into the main (or supply) line, a differential pressure relief valve 26 as described and claimed in our said co-pending patent application No 19480/78 (Serial No 1577043) is installed to monitor 11 ( the pressure differential across the upstream check valve A backflow condition exists when the outlet pressure of the assembly exceeds the inlet pressure If this should occur, backflow would normally be pre 11 vented by the downstream check valve If this check valve should become fouled or damaged, the backflowing fluid will enter the zone between the two check valves As this zone pressure approaches the inlet pressure, 121 the differential pressure relief valve 26 will operate to maintain the zone pressure at least 2 p s i less than the supply line pressure, and the backflowing fluid will be discharged to atmosphere 12.
Claims (4)
1 A check valve assembly including a housing a valve seat in said housing defining part of a fluid flow passageway through the assembly a valve cover mounted on said 131 D D D 1,577,044 housing for pivotal movement about an axis normal to the direction of fluid flow along said passageway and adapted to cooperate with said valve seat to control fluid flow through said valve assembly, a track fixedly mounted at the rear of said valve cover extending in a direction normal to the pivot axis of said valve cover, a roller assembly mounted on said track for movement thereon, link means pivotally connected at one end with said valve cover and projecting rearwardly from said valve cover, the other end of said link means being pivotally mounted on said roller assembly, means biasing said roller assembly to a valve closed position, said link means making an acute angle with the direction of fluid flow when said valve cover is in the closed position whereby a large portion of the force tending to open said valve cover is exerted against said track.
2 The check valve assembly of claim 1, wherein said valve cover is pivotally mounted on said housing by means of a hinge member with which said link means is connected.
3 The check valve assembly of claim 2 wherein said hinge member pivot axis lies in the plane of said valve seat face.
4 The check valve assembly of claim 1, 2 or 3 in which said housing includes a removable cover member, said cover member providing a seat for a spring forming said biasing means, and whereby the valve cover and associated elements are accessible for servicing by removal of said cover member.
The check valve assembly of any one of the preceding claims, wherein said angle the link means makes with the direction of fluid flow at the closed position is approximately 30 degrees.
SHAW, BOWKER & FOLKES For the Applicants Printed for Her Majesty's Stationery Office, by Croydon Printing Company Limited, Croydon, Surrey, 1980.
Published by The Patent Office, 25 Southampton Buildings, London, WC 2 A IAY, from which copies may be obtained.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/668,627 US3996962A (en) | 1976-03-19 | 1976-03-19 | Backflow preventer and relief valve assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1577044A true GB1577044A (en) | 1980-10-15 |
Family
ID=24683121
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19480/78A Expired GB1577043A (en) | 1976-03-19 | 1977-03-11 | Fluid flow assembly including pressure differential valve |
GB10320/77A Expired GB1577042A (en) | 1976-03-19 | 1977-03-11 | Backflow prevention assembly |
GB19481/78A Expired GB1577044A (en) | 1976-03-19 | 1977-03-11 | Check valve assembly |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19480/78A Expired GB1577043A (en) | 1976-03-19 | 1977-03-11 | Fluid flow assembly including pressure differential valve |
GB10320/77A Expired GB1577042A (en) | 1976-03-19 | 1977-03-11 | Backflow prevention assembly |
Country Status (9)
Country | Link |
---|---|
US (2) | US3996962A (en) |
JP (1) | JPS52116931A (en) |
AU (1) | AU2293077A (en) |
CA (1) | CA1081084A (en) |
DE (1) | DE2711974A1 (en) |
FR (1) | FR2344769A1 (en) |
GB (3) | GB1577043A (en) |
NL (1) | NL7702988A (en) |
SE (1) | SE7703047L (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4706706A (en) * | 1984-11-19 | 1987-11-17 | Corrotex Limited | Check valve and a seal for a check valve |
Families Citing this family (77)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2747941C2 (en) * | 1977-10-26 | 1985-02-14 | Lang Apparatebau GmbH, 8227 Siegsdorf | Device for protecting drinking water pipes against backflowing process water |
AT372448B (en) * | 1977-10-26 | 1983-10-10 | Lang Apparatebau Gmbh | DEVICE FOR PROTECTING DRINKING WATER PIPES AGAINST RETURNING HOT WATER |
US4284097A (en) * | 1978-03-28 | 1981-08-18 | Amtrol Inc. | In line back flow preventer |
US4232704A (en) * | 1978-03-28 | 1980-11-11 | Amtrol Inc. | In line back flow preventer |
US4420010A (en) * | 1978-03-28 | 1983-12-13 | Amtrol Inc. | In-line back flow preventer |
US4241752A (en) * | 1978-05-30 | 1980-12-30 | Watts Regulator Company | Backflow preventer |
US4276897A (en) * | 1978-06-23 | 1981-07-07 | Griswold Controls | Backflow prevention apparatus |
DE2849825C2 (en) * | 1978-11-17 | 1984-05-10 | Lang Apparatebau GmbH, 8227 Siegsdorf | Drinking water flow fitting with a flow monitor built into a drinking water supply line |
US4231387A (en) * | 1979-01-11 | 1980-11-04 | Chas. M. Bailey Co., Inc. | Backflow preventing valve |
US4452272A (en) * | 1980-02-13 | 1984-06-05 | Griswold Controls | Check valve |
US4506694A (en) * | 1982-05-28 | 1985-03-26 | Mueller Co. | Relief valve assembly for use with backflow preventers |
US4553563A (en) * | 1982-05-28 | 1985-11-19 | Mueller Co. | Relief valve assembly for use with backflow preventers |
US4523607A (en) * | 1982-05-28 | 1985-06-18 | Mueller Co. | Backflow preventer apparatus |
US4989635A (en) * | 1989-11-13 | 1991-02-05 | Cmb Industries, Inc. | Check valve with reduced hold-open pressure |
US5176172A (en) * | 1991-01-22 | 1993-01-05 | Watts Regulator Company | Toggle linkage check valve |
US5236009A (en) * | 1991-01-22 | 1993-08-17 | Watts Investment Company | Double check backflow preventer with improved toggle linkage check valve |
US5072753A (en) * | 1991-01-22 | 1991-12-17 | Watts Regulator Company | Toggle linkage check valve |
CA2074448C (en) * | 1991-09-18 | 1997-01-14 | John Philip Scaramucci | Top-entry check valve having retainer ring |
US5191913A (en) * | 1991-09-18 | 1993-03-09 | Scaramucci John P | Top-entry check valve with pin fasteners |
DE4204386C2 (en) * | 1992-02-14 | 1994-01-20 | Honeywell Braukmann Gmbh | System separator |
JP2683880B2 (en) * | 1994-01-31 | 1997-12-03 | 博 横田 | Combined actuation non-water hammer check valve device |
US5947152A (en) * | 1995-08-11 | 1999-09-07 | Grinnell Corporation | Check valve and backflow preventer |
US5709240A (en) * | 1995-08-11 | 1998-01-20 | Grinnell Corporation | Check valve and backflow preventer |
US5711341A (en) * | 1997-02-25 | 1998-01-27 | Conbraco Industries, Inc. | Swing-type check valve assembly retained within a valve housing by abutting engagement with a valve cover and a port of the valve housing |
US5794655A (en) * | 1997-02-25 | 1998-08-18 | Conbraco Industries, Inc. | Swing-type check valve assembly having an integrated valve seat and valve housing cover |
US5950653A (en) * | 1998-03-27 | 1999-09-14 | Folsom; William D. | High pressure relief valve for use with a backflow preventer |
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US7434593B2 (en) * | 2002-10-23 | 2008-10-14 | Zurn Industries, Llc | Double check valve assembly |
US7775966B2 (en) | 2005-02-24 | 2010-08-17 | Ethicon Endo-Surgery, Inc. | Non-invasive pressure measurement in a fluid adjustable restrictive device |
US7784483B2 (en) | 2005-01-21 | 2010-08-31 | Zurn Industries, Llc | Backflow preventer |
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US8066629B2 (en) | 2005-02-24 | 2011-11-29 | Ethicon Endo-Surgery, Inc. | Apparatus for adjustment and sensing of gastric band pressure |
US7775215B2 (en) | 2005-02-24 | 2010-08-17 | Ethicon Endo-Surgery, Inc. | System and method for determining implanted device positioning and obtaining pressure data |
US7699770B2 (en) | 2005-02-24 | 2010-04-20 | Ethicon Endo-Surgery, Inc. | Device for non-invasive measurement of fluid pressure in an adjustable restriction device |
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US7927270B2 (en) | 2005-02-24 | 2011-04-19 | Ethicon Endo-Surgery, Inc. | External mechanical pressure sensor for gastric band pressure measurements |
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US7293576B2 (en) * | 2005-03-28 | 2007-11-13 | Potter Electric Signal Company | Single-piece manifold with reduced pressure arrangement |
US20060266422A1 (en) * | 2005-05-26 | 2006-11-30 | Feenstra Shawn J | Check valve with an improved clapper and valve seat |
US20070028970A1 (en) * | 2005-08-08 | 2007-02-08 | Proulx John J Jr | Public water system protection apparatus |
US20070204917A1 (en) * | 2006-03-01 | 2007-09-06 | Rain Bird Corporation | Backflow prevention device |
US20070204916A1 (en) * | 2006-03-01 | 2007-09-06 | Rain Bird Corporation | Backflow prevention device |
US8152710B2 (en) | 2006-04-06 | 2012-04-10 | Ethicon Endo-Surgery, Inc. | Physiological parameter analysis for an implantable restriction device and a data logger |
US8870742B2 (en) | 2006-04-06 | 2014-10-28 | Ethicon Endo-Surgery, Inc. | GUI for an implantable restriction device and a data logger |
US8187163B2 (en) | 2007-12-10 | 2012-05-29 | Ethicon Endo-Surgery, Inc. | Methods for implanting a gastric restriction device |
US8100870B2 (en) | 2007-12-14 | 2012-01-24 | Ethicon Endo-Surgery, Inc. | Adjustable height gastric restriction devices and methods |
US8142452B2 (en) | 2007-12-27 | 2012-03-27 | Ethicon Endo-Surgery, Inc. | Controlling pressure in adjustable restriction devices |
US8377079B2 (en) | 2007-12-27 | 2013-02-19 | Ethicon Endo-Surgery, Inc. | Constant force mechanisms for regulating restriction devices |
US8337389B2 (en) | 2008-01-28 | 2012-12-25 | Ethicon Endo-Surgery, Inc. | Methods and devices for diagnosing performance of a gastric restriction system |
US8591395B2 (en) | 2008-01-28 | 2013-11-26 | Ethicon Endo-Surgery, Inc. | Gastric restriction device data handling devices and methods |
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Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3173439A (en) * | 1961-06-26 | 1965-03-16 | Donald G Griswold | Backflow prevention device |
US3276465A (en) * | 1963-01-18 | 1966-10-04 | Donald G Griswold | Backflow prevention device and relief valve control |
US3283772A (en) * | 1964-02-04 | 1966-11-08 | Donald G Griswold | Backflow prevention device with improved pressure sensing means |
AU453792B2 (en) * | 1968-09-29 | 1974-09-26 | HARLEY JAMES ARTHUR and MAURICE JOHN FACTORY | Improvements in and relating toback flow preventors |
US3817278A (en) * | 1971-08-09 | 1974-06-18 | Fwi Inc | Spring closing check valve |
US3837358A (en) * | 1971-12-06 | 1974-09-24 | Cla Val Co | Backflow preventer valve assembly |
IL45802A (en) * | 1973-10-26 | 1977-05-31 | Griswold Controls | Check valve useful in backflow prevention apparatus |
-
1976
- 1976-03-19 US US05/668,627 patent/US3996962A/en not_active Expired - Lifetime
- 1976-07-19 US US05/706,350 patent/US4090527A/en not_active Expired - Lifetime
-
1977
- 1977-03-04 AU AU22930/77A patent/AU2293077A/en not_active Expired
- 1977-03-11 GB GB19480/78A patent/GB1577043A/en not_active Expired
- 1977-03-11 GB GB10320/77A patent/GB1577042A/en not_active Expired
- 1977-03-11 GB GB19481/78A patent/GB1577044A/en not_active Expired
- 1977-03-16 CA CA274,069A patent/CA1081084A/en not_active Expired
- 1977-03-17 JP JP2974677A patent/JPS52116931A/en active Pending
- 1977-03-17 SE SE7703047A patent/SE7703047L/en unknown
- 1977-03-18 NL NL7702988A patent/NL7702988A/en not_active Application Discontinuation
- 1977-03-18 FR FR7708197A patent/FR2344769A1/en active Granted
- 1977-03-18 DE DE19772711974 patent/DE2711974A1/en not_active Ceased
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4706706A (en) * | 1984-11-19 | 1987-11-17 | Corrotex Limited | Check valve and a seal for a check valve |
Also Published As
Publication number | Publication date |
---|---|
FR2344769A1 (en) | 1977-10-14 |
NL7702988A (en) | 1977-09-21 |
GB1577042A (en) | 1980-10-15 |
FR2344769B1 (en) | 1980-10-10 |
US4090527A (en) | 1978-05-23 |
US3996962A (en) | 1976-12-14 |
DE2711974A1 (en) | 1977-09-29 |
SE7703047L (en) | 1977-09-20 |
AU2293077A (en) | 1978-09-07 |
GB1577043A (en) | 1980-10-15 |
CA1081084A (en) | 1980-07-08 |
JPS52116931A (en) | 1977-09-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |